Alloys



Patented Sept, 7, I i937 George R. Couls, Detroit, Mich.

m Drawing. Application June 1'1, 1936,

Serial No. 85,697

1 Claim. '(01. 75-176) The present invention relates to metal alloys and particularly to alloys which are largely ferrous in their composition but which contain components rendering them particularly suitable for cutting tools. i a

Among the objects of the invention is analloy having the characteristics of fineness of grain,

hardness, toughness, and rigidity at relatively high temperatures so as to be suitable for high In these two formulae the proportions and constituents are the same and the second is preferred as the ferrochrome and ferrotungsten supply the iron required, and usually J part; of the 35 carbon. 1

While the above more or less exact proportions- .and constituents are preferred and produce a Q satisfactory product, some variation is permitted.

For example, molybdenum or vanadium may be substituted for a part or all of the tungsten to produce a product which has the necessary characteristics but in a lesser degree. Also a greater proportion of carbon seems to increase the hardness but at the same time makes the product more brittle. If, however, when increasing the carbon content, the copper is also increased, some 5 of the brittleness is prevented.

In making the alloy it is preferred to fuse together all of the constituents except the copper and to thoroughly mix, then to add the copper.

If desired, the melt may be made of the con- 10 stituents without, the copper and allowed to set. This, however, must be remelted and the copper added to produce a. product having the desirable properties. After the addition of the copper the mass should be maintained in the molten condi- .tion for a short period to permit the copper to exert its action upon the mixed constituents.

' The copper seems to toughen the resulting product. K

When making the cfopper addition, it is pre- 20 ferred to mix the copper in the melt and allow Per cent Cobalt 22.6 to 22.3 Chr m 27.2 to 22.8 Tungsten 22.6 to 19 Iron 20.2 to 1'1 Car n about.4.5 Copper about 1 .GEORGE R. CCUIS. 

